You can submit SAS MPCONNECT code from within EG and, provided that your server has the correct infrastructure, it should work as expected. In this scenario, you are using EG to connect to a single workspace SAS session, and then MPCONNECT is farming out the various jobs to other SAS CONNECT servers that you have configured.
If you use EG to run tasks/code on multiple SAS servers that you have configured (ex: SASMain, SASMain2, etc), EG will run tasks in parallel as long as the tasks do not depend on each other's results. In this scenario, EG is simply submitting multiple jobs across the various servers and collecting the results in a single place (your EG project).
More information about SAS parallel processing and scalability is available at:
http://support.sas.com/rnd/scalability/
Chris
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